Why magnesium matters
Magnesium deficiency is one of the most consistently documented findings in research on head discomfort. Studies show that people who experience frequent episodes tend to have significantly lower magnesium levels in their blood than people who don’t. Magnesium matters because it helps keep brain activity in balance. It regulates the release of chemical messengers between brain cells and blocks a receptor called NMDA, which acts like a volume dial for overall brain excitability. When NMDA receptors are overactive, the brain becomes more excitable and more prone to both head discomfort and amplified pain signaling. Magnesium also helps calm a slow wave of electrical activity that spreads across the surface of the brain, which scientists believe is the trigger for the visual and sensory disturbances known as aura.
What the evidence shows
A landmark randomized, double-blind, placebo-controlled trial published in Cephalalgia found that oral magnesium supplementation at 600 mg/day reduced head discomfort episode frequency by approximately 41.6% compared to 15.8% in the placebo group over 12 weeks.
Migra-Health provides 600 mg of magnesium citrate per serving, which delivers 72 mg of elemental magnesium. Supplement labels state the elemental figure; research papers vary, so the two numbers are given together throughout this page.
Multiple subsequent trials have replicated this finding. A meta-analysis of seven clinical trials concluded that magnesium supplementation significantly reduced head discomfort frequency with high statistical confidence.
Source: Peikert A, et al. Cephalalgia. 1996;16(4):257-263. Köseoglu E, et al. Magnesium Research. 2008;21(2):101-108.
Why citrate form
Magnesium citrate offers superior bioavailability compared to magnesium oxide, the form found in most lower cost supplements. Because citrate is water soluble, it dissolves readily in the digestive tract and is absorbed far more efficiently, so more of each dose reaches the bloodstream and tissues where it is needed. It is also one of the most extensively studied forms of magnesium in both clinical and head discomfort research, which is why it often serves as the reference standard when comparing supplements. At higher doses citrate can have a mild laxative effect, which some people find helpful for occasional constipation.
